package com.hnd.test;

import javax.xml.crypto.Data;
import java.util.HashMap;
import java.util.Map;

public class UserDao {
    static Map<String, String> data = new HashMap<>();

    static {

        data.put("hnd", "hello");
    }

    public void query(String key) {
        System.out.println(data.get(key));
    }
}
